Cummins diesel engine is made in America and is among the most well-known manufacturers of diesel engines along with German made DEUTZ diesel engines. FLEETGUARD filters that are themselves among the most advanced engine filters in the world are designed and manufactured by Cummins industrial group. various heavy duty industrial machines such as construction and mining machines, power generators and compressors use Cummins diesel engines. different types of filters are used on diesel engines that fuel filter is the most important one since gas-oil that is being consumed by diesel engines is among one of the most polluted fuels. separator filters that are also one type of fuel filter is the most recent type of filter for diesel engines.